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Cryolite occurs in colourless or snow-white cleavable masses, often tinted brown or red with iron oxide, and occasionally passing into a black variety.

Mica: this term includes several minerals, which all agree in being highly cleavable into thin elastic flakes or lamin�, which have a glistening metallic lustre.

Large, cleavable masses yielding fine smoky-black and green sheets, sufficiently elastic for industrial purposes, are, however, found in Renfrew county, Ontario.

Crystallizes in rhombohedrons with curved faces; these crystals are distinctly cleavable and massive.

It occurs in cleavable masses, and also crystallized.